From the specified fmt_args return a type convertible to format_arg_store that is suitable for use by the wchar_t-based bslfmt::format functions.
Declared in <bslfmt_format_args.h>
template<class... t_ARGS>
Format_ArgsStore<wformat_context, t_ARGS...>
make_wformat_args(t_ARGS&... fmt_args);